请教一道数学题啊

Q5:

The sides of a square region, measured to the nearest centimeters, are 6 centimeters long.  The least possible value of the actual area of the square region is

A.     36.00 sq cm

B.     35.00 sq cm

C.     33.75 sq cm

D.     30.25 sq cm

E.      25.00 sq cm

measured to the nearest centimeters是什么意思啊 本题选D

请大牛指点

就是四舍五入后为6cm

所以实际的边长在5.5-6.4这个范围，求最小面积肯定取5.5啦

5.5*5.5=30.25

D